RAIN MEASUREMENTS FOR MM-WAVE PROPAGATION: A REVIEW

Abstract

This paper is a review of rain parameters, and their measurements, pertinent to electromagnetic wave propagation at super-high frequency (SHF) and extremely-high frequency (EHF) parts of the spectrum. The rain-rate parameter is first presented along with the major experimental studies on rain-rate statistics. Other rain parameters, including drop-fall speed, drop-shape, drop-size distribution and canting angle, are also dealt with. Direct and indirect methods of measuring rain parameters are then addressed, together with a description of the instruments used.